Absolutely think there should be a section for DAB radio generally. Perhaps have a layout like this for the list of main forums:
London pirate radio
UK Pirate Radio
Irish Pirate Radio
Legal FM Radio
DAB radio
and all the forums below (international etc) remain as they are.

According to the Dutch poster, his rig is set outside the legal freq band so yes.
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No - what they've done (and I've got running at a few milliwatts here) is to put on an extra "bouquet" of stations. DAB has six "bouquets", each about 6 MHz wide. Each of these is crammed with stations. Most cities use four out of the possible six, so pirates put on an extra bouquet, to "fill in the gap". They're using "legal" frequencies (a DAB radio will only tune to the limited band of discrete centre frequencies for the bouquets) - putting a bouquet adjacent to the "legal" stations might work with some receivers, but it's unlikely.

The other huge problem with DAB is getting people to re-tune their receivers to find the "extra" signals. It's not like spinning the dial on FM and hearing an extra station between the legitimate ones.

There are more than 6 ensembles (bouquets) available. There are 7 transmitting in London alone
3 x London 11B, 12A, 12C
2 x National 11A, 11D,
1x BBC 12B
1x London small scale trial 9A
and from my location in North London I can also hear the Herts/Bed/Bucks, 10D so making 8 ensembles.
A pirate in London could easily use channel 7D which is currently being used by the small scale trial DABs in Cambridge and Portsmouth, without causing interference unless they are going to run kilowatts.
The London small scale DAB currently uses 2 sites each with 800w transmitters to cover an area inside the M25. The coverage of the 800w transmitter is probably similar to that of a 100w FM transmitter, which seems not very cost effective until you realise you can run 20 or more stations on the one 800w transmitter.